Haven't been through the above but it looks like there should be some good stuff there.

Don't forget Edinburgh fest itself, worlds biggest arts festival. about a ton and a half of things going on, and a folk festival is one of them. Last 3 weeks in August approx.

I'm trying to remember which of the Western Isle festivals Ian MacCalman described as 200 drunks hanging on to a rock....it'll come to me

Z(R)